<template>
    <!-- 商品分类导航 -->
        <div class="type-nav" >
            <div class="container"  @mouseleave="leaveShow">
                <h2 class="all"  @mouseenter="showVal(-1)">全部商品分类</h2>
                <nav class="nav">
                    <a href="###">服装城</a>
                    <a href="###">美妆馆</a>
                    <a href="###">尚品汇超市</a>
                    <a href="###">全球购</a>
                    <a href="###">闪购</a>
                    <a href="###">团购</a>
                    <a href="###">有趣</a>
                    <a href="###">秒杀</a>
                </nav>
                <transition name="sort">
   <div class="sort"  v-show="show"  @mouseleave="changeIndex(-1)">
                    <div class="all-sort-list2" @click="goSearch($event)" >
                        <div class="item" v-for="(item1,index) in reqCategoryList"
                        :key="item1.categoryId"
                        :class="{cur:currentIndex===index}"
                        >
                            <h3  @mouseenter="changeIndex(index)" >
                                <a :data-categoryName="item1.categoryName" :data-category1Id="item1.categoryId" href="javascript:;">{{item1.categoryName}}</a>
                            </h3>
                            <div class="item-list clearfix" :style="{display:currentIndex==index?'block':'none'}">
                                <div class="subitem" v-for="item2 in item1.categoryChild"
                                :key="item2.categoryId"
                                >
                                    <dl class="fore">
                                        <dt>
                                            <a :data-category2Id="item2.categoryId" :data-categoryName="item2.categoryName" href="javascript:;">{{item2.categoryName}}</a>
                                        </dt>
                                        <dd>
                                            <em v-for="item3 in item2.categoryChild" :key="item3.categoryId">
                                                <a :data-category3Id="item3.categoryId" :data-categoryName="item3.categoryName" href="javascript:;">{{item3.categoryName}}</a>
                                            </em>
                                           
                                        </dd>
                                    </dl>
                                </div>
                            </div>
                        </div>
                
                    </div>
                </div>
                </transition>
             
            </div>
        </div>

</template>

<script>
import {mapState} from "vuex"
import throttle from "lodash/throttle"

export default {
  name:"TypeNav",
  data(){
      return {
         currentIndex:-1,
         show:true,
      }
  },
  methods:{
    changeIndex:throttle(function(index){
      
      this.currentIndex=index;
    
    
    },50),
    goSearch(e){

      let element=e.target

      let {categoryname,category1id,category2id,category3id}=element.dataset
       if(categoryname){
         
         let location={name:"search"}
         let query={categoryName:categoryname}
         if(category1id){
             query.category1Id=category1id
         }else if(category2id){
             query.categoryId=category2id
         }else{
            query.category3Id=category3id
         }
        if (this.$route.params) {
          location.params = this.$route.params;
          //动态给location配置对象添加query属性
          location.query = query;
          //路由跳转
          this.$router.push(location);
        }
       
       } 
   },
    showVal(index){
        this.currentIndex=index
            this.show=true
        
       
    },
    leaveShow(){
     
     if(this.$route.path!="/home"){
         this.show=false
     }
    }
      
  },
    //mounted方法 是在页面中html渲染后自动调用的 属于生明周期
  mounted(){
    
      if(this.$route.path!="/home"){
          this.show=false
      }
  },

  computed:{
      ...mapState({
          reqCategoryList:state=>state.home.reqCategoryList.slice(0,16)
      })
  }
}
</script>

<style lang="less">
     .type-nav {
        border-bottom: 2px solid #e1251b;

        .container {
            width: 1200px;
            margin: 0 auto;
            display: flex;
            position: relative;

            .all {
                width: 210px;
                height: 45px;
                background-color: #e1251b;
                line-height: 45px;
                text-align: center;
                color: #fff;
                font-size: 14px;
                font-weight: bold;
            }

            .nav {
                a {
                    height: 45px;
                    margin: 0 22px;
                    line-height: 45px;
                    font-size: 16px;
                    color: #333;
                }
            }

            .sort {
                position: absolute;
                left: 0;
                top: 45px;
                width: 210px;
                height: 461px;
                position: absolute;
                background: #fafafa;
                z-index: 999;

                .all-sort-list2 {
                    .item {
                        h3 {
                            line-height: 30px;
                            font-size: 14px;
                            font-weight: 400;
                            overflow: hidden;
                            padding: 0 20px;
                            margin: 0;

                            a {
                                color: #333;
                            }
                        }

                        .item-list {
                           
                            position: absolute;
                            width: 734px;
                            min-height: 460px;
                            background: #f7f7f7;
                            left: 210px;
                            border: 1px solid #ddd;
                            top: 0;
                            z-index: 9999 !important;

                            .subitem {
                                float: left;
                                width: 650px;
                                padding: 0 4px 0 8px;

                                dl {
                                    border-top: 1px solid #eee;
                                    padding: 6px 0;
                                    overflow: hidden;
                                    zoom: 1;

                                    &.fore {
                                        border-top: 0;
                                    }

                                    dt {
                                        float: left;
                                        width: 54px;
                                        line-height: 22px;
                                        text-align: right;
                                        padding: 3px 6px 0 0;
                                        font-weight: 700;
                                    }

                                    dd {
                                        float: left;
                                        width: 415px;
                                        padding: 3px 0 0;
                                        overflow: hidden;

                                        em {
                                            float: left;
                                            height: 14px;
                                            line-height: 14px;
                                            padding: 0 8px;
                                            margin-top: 5px;
                                            border-left: 1px solid #ccc;
                                        }
                                    }
                                }
                            }
                        }

                   
                    }
                    .cur{
                        background-color:skyblue;
                    }
                    
                }
            }
            .sort-enter{
                height:0px;
            }
            .sort-enter-to{
                height:461px;
            }
            .sort-enter-active{
                transition:all .5s linear
            }
        }
    }

</style>